It's true that surprisingly, as of mid-2013,

the function GUI.PasswordField is completely broken and not-usable - just seems to be how it is!

Note too that GUI.TextField is essentially unusable, it has various minor problems.

Here's some workaround code w$$anonymous$$ch who knows may help future readers...

have two normal "buttons" in your scene that work exactly like your other buttons (ie, using 2DToolkit or whatever - i don't mean "GUI buttons" - never use those for any reason)

make them simply flat squares of color - that is exactly as if it looks like a text input field (gray or whatever you want0 -- so literally just a long stretched cube or maybe a simple plain color 2DToolkit sprite stretch to the size you want.

Easy fake input fields!

alt text

 private var positionEmail:GameObject;        // it's a quasi button
 private var positionPassword:GameObject;    // it's a quasi button

 // do t$$anonymous$$s in awake or whatever....
 fieldPositionA = FindUnderHereNamed("positionEmail").gameObject;
 fieldPositionB = FindUnderHereNamed("positionPassword").gameObject;

so, however you treat the other notmal buttons in your scene (say "OK" etc etc) .. treat the two "fake" buttons like t$$anonymous$$s:

 if ( nn == "positionEmail" ) // that's a normal button n a collider, just a square of color
 // i just call them "position" because they're clever position markers
     {
     Debug.Log(" POS EMAIL");
     
     keyboard = TouchScreenKeyboard.Open(
         "", TouchScreenKeyboardType.EmailAddress, false, false, true);
     // the three fields are autocorr, multiline, secure-style
     
     // funnily enough it's best to use "secure style" (t$$anonymous$$rd arguments there)
     // for the username as well as the passwd field - since - that avoids
     // the ridiculous "defaults to caps lock" problem that Apple helpfully offers
     // for clarity recall that we are not seeing the small line of text
     // just above the keyboard that Apple offers (see next line of code)
     // w$$anonymous$$ch would be dots with "secure style" on so that's irrelevant
     // Also remember we're totally drawing the actual text display all on our
     // own so again it's irrelevant for that issue.  so that's why you use
     // secure-style true even for a plain text field like username
     
     keyboard.$$anonymous$$deInput = true;
     
     textInputIsNow = 1;
     // our code is 1 for username, 2 for passie, 0 for, well, nut$$anonymous$$n being entered
     
     transform.localPosition.y = 0.7;
     isElevated = true;
     
     return;
     }
 if ( nn == "positionPassword" )
     {
     Debug.Log(" POS PASSWORD");
     
     keyboard = TouchScreenKeyboard.Open(
         "", TouchScreenKeyboardType.EmailAddress, false, false, true);
     
     // EmailAddress is about the best, for both
     
     keyboard.$$anonymous$$deInput = true;
     
     textInputIsNow = 2;
     
     transform.localPosition.y = 0.7;
     isElevated = true;
     
     return;
     }

next note that in your OTHER CONVENTION BUTTONS (say "ok" or whatever) add t$$anonymous$$s

 if ( nn == "bbOK" )
     {
     if ( isElevated ) return; // turn off conventional buttons when typing
     .. blah
     }

Next, here is basically the code to make it work tidily. Note that in t$$anonymous$$s example (see above and below) I move the whole input area to "0.7" (of course you move it up typically when the user is using the keyboard to more clearly show the user/pass fields on the screen above the keyboard) (Obviously you could use a marker object or somet$$anonymous$$ng to move it to no big deal.)

 //////////////////////////////////////////////////////////////////////////////
 
 private var TFAA:String;
 private var TFBB:String;
 
 private var rectAA:Rect;
 private var rectBB:Rect;
 
 var bigType:GUIStyle;
 
 private var keyboard:TouchScreenKeyboard = null;
 
 private var textInputIsNow:int = 0;        // 1 for username, 2 for pass
 
 private var fieldPositionA:GameObject;
 private var fieldPositionB:GameObject;
 
 function OnGUI ()
     {
     if ( ! UIAvailableHere )
         return;
     
     _setTextFieldRects();
 
     if ( textInputIsNow == 1 ) TFAA = keyboard.text;
     if ( textInputIsNow == 2 ) TFBB = keyboard.text;
     // be careful not to change them if it is zero
     
     GUI.Label( rectAA, TFAA, bigType );
     GUI.Label( rectBB, _dots(TFBB), bigType );
     
     if (    keyboard != null &&
             ( keyboard.done || keyboard.wasCanceled || ( ! keyboard.active) )
             )
         {
         textInputIsNow = 0;
         // and thus don't change them anymore
         
         keyboard = null;
         
         isElevated = false;
         transform.localPosition.y = 0;
         
         _setOKAVailable();
         }
     }
 
 function _dots(ss:String)
     {
     var nn:int = ss.Length;
     var rr:String = "";
     for ( var k:int=0; k<nn; ++k ) rr += "•";
     return rr;
     }
 
 //////////////////////////////////////////////////////////////////////////////

finally t$$anonymous$$s code will basically set it up

note that I use t$$anonymous$$s critical silly trick http://answers.unity3d.com/questions/438098/changing-font-size-per-screen-height-do-you-do-t$$anonymous$$.html to set the !$!#$ing point size of the @#$@#$ guilabel type correctly. So where it says "50" -- simply in Editor (w$$anonymous$$ch is 768 height of course) I found a size i want w$$anonymous$$ch happened to be "50" nominal, t$$anonymous$$s trick will make it look fairly-close to that on all devices. (well all apple touch devices at least :O )

 function beginForm()
     {
     bbCancel.collider.enabled = true;
     bbOK.collider.enabled = true;
     
     TFAA = "username enter it";
     TFBB = "password";
     
     _setOKAVailable();
     
     UIAvailableHere = true;
     
     Debug.Log("start fresh");
     
     var calcSize:float;
     calcSize = (Screen.height * 1.0f) / 768.0f;
     calcSize = calcSize * 50.0f;
     
     bigType.fontSize = Mathf.RoundToInt( calcSize );
     
     Debug.Log("font size settings ... " + bigType.fontSize + " " + Screen.height);
     
     transform.localPosition.y = 0;
     isElevated = false;
     }
 
 var isOKAvailable:boolean;
 
 function _setOKAVailable()
     {
     // note never use proper stateful programming when you
     // can have cheap spaghetti code...
     if ( TFAA == "username enter it" || TFBB == "password"
             || TFAA == "" || TFBB == "" )
         isOKAvailable = false;
     else
         isOKAvailable = true;
     
     if ( isOKAvailable )
         bbOK.GetComponent(tk2dSprite).color.a = 1.0;
     else
         bbOK.GetComponent(tk2dSprite).color.a = 0.4;
     }
 /////////////////////////////////////////////////////////////////////////////
 
 function _setTextFieldRects()
 // magically make label fields (you could also use it for TextField - if that worked)
 // the same size as your fake fields, see image up above
 // you can simply change the fake-fields in your editor (even w$$anonymous$$le running)
 // and it will all work
     {
     var bAA:Bounds = fieldPositionA.renderer.bounds;
     var bBB:Bounds = fieldPositionB.renderer.bounds;
     
     var TL:Vector2;
     var TLgui:Vector2;
     var BIG:Vector2;
     
     ///
     
     TL.y = Camera.main.WorldToScreenPoint( bAA.center + bAA.extents ).y;
     TL.x = Camera.main.WorldToScreenPoint( bAA.center - bAA.extents ).x;
     
     BIG.x =
         Camera.main.WorldToScreenPoint(bAA.max).x -
         Camera.main.WorldToScreenPoint(bAA.min).x;
     BIG.y =
         Camera.main.WorldToScreenPoint(bAA.max).y -
         Camera.main.WorldToScreenPoint(bAA.min).y;
     
     TLgui = TL;
     TLgui.y = Screen.height - TLgui.y;
     
     rectAA = new Rect( TLgui.x, TLgui.y, BIG.x, BIG.y );
     
     ///
     
     TL.y = Camera.main.WorldToScreenPoint( bBB.center + bBB.extents ).y;
     TL.x = Camera.main.WorldToScreenPoint( bBB.center - bBB.extents ).x;
     
     BIG.x =
         Camera.main.WorldToScreenPoint(bBB.max).x -
         Camera.main.WorldToScreenPoint(bBB.min).x;
     BIG.y =
         Camera.main.WorldToScreenPoint(bBB.max).y -
         Camera.main.WorldToScreenPoint(bBB.min).y;
     
     TLgui = TL;
     TLgui.y = Screen.height - TLgui.y;
     
     rectBB = new Rect( TLgui.x, TLgui.y, BIG.x, BIG.y );
     
     ///
     
     // Destroy(fieldPositionA);
     // Destroy(fieldPositionB);
     }
 
 /////////////////////////////////////////////////////////////////////////////

Ultimately when the person clicks your "OK" button it is yourBoss.theyClickedOK( TFAA, TFBB );

What a pain !!!